#include<stdio.h>
int main()
{
    float x,y;
    printf("enter x:");
    scanf("%f",&x);
    if(x<1)
    y=x;
    else if(x>=1)
    if(x<10)
    y=2*x-1;
    else
    y=3*x-11;
    printf("y=%f\n",y);
}